Back to EveryPatent.com
United States Patent | 5,073,830 |
Loucks | December 17, 1991 |
An optical system is disclosed which combines a collimating lens with a half wave plate, a polarizing beam splitter, and imaging optics to create a polarized image of a non-polarized light source. This optical system has significant benefits of energy efficiency and brightness.
Inventors: | Loucks; Bryan E. (Los Altos Hills, CA) |
Assignee: | Greyhawk Systems, Inc. (Milpitas, CA) |
Appl. No.: | 462416 |
Filed: | January 9, 1990 |
Current U.S. Class: | 359/495 |
Intern'l Class: | G02B 027/28 |
Field of Search: | 350/394,401,404,420,172,173 353/20,31,34 |
2274110 | Feb., 1942 | Ward, Jr. | 350/401. |
3497283 | Feb., 1970 | Law | 350/394. |
4125843 | Nov., 1978 | Whitby | 350/401. |
4461542 | Jul., 1984 | Gagnon | 350/401. |
4560999 | Dec., 1985 | Tokuhara | 350/401. |
4564931 | Jan., 1986 | O'Hara et al. | 350/401. |
4744073 | May., 1988 | Sugiki | 350/420. |
4800556 | Jan., 1989 | Charlier et al. | 350/401. |
4804264 | Feb., 1989 | Kirchhofer et al. | 350/401. |
4827334 | May., 1989 | Johnson et al. | 350/401. |
4850685 | Jul., 1989 | Kamakura et al. | 350/401. |
4864390 | Sep., 1989 | McKechnie et al. | 358/60. |
4936658 | Jun., 1990 | Tanaka et al. | 350/408. |
4962997 | Oct., 1990 | Baldwin | 350/172. |